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Segment and Related Information, Sales by Product Category (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 447.5 | $ 464.1 | $ 464.7 | $ 431.3 | $ 432.1 | $ 424.5 | $ 414.1 | $ 405.0 | $ 1,807.6 | $ 1,675.7 | $ 1,638.0
Metalcasting [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 328.9 | 294.3 | 258.0
Household, Personal Care & Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 248.8 | 169.6 | 171.2
Environmental Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 80.3 | 67.7 | 78.9
Building Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 70.4 | 78.2 | 74.1
Basic Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 99.7 | 125.0 | 103.9
Paper PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 378.5 | 377.7 | 387.9
Specialty PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 66.9 | 66.0 | 64.3
Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 91.0 | 87.3 | 83.6
Talc [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 52.9 | 53.8 | 55.7
Refractory Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 261.1 | 226.9 | 219.0
Metallurgical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 50.8 | 52.5 | 55.5
Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 78.3 | $ 76.7 | $ 85.9

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